I have used this to stow my tools, keys, ID, and phone for recreational and commuter riding. I have owned a cage rocket so long I can't remember not having it. I have accidentally pulled the lid off, but the hinge pins have never broken and snap back into place. It has never fallen out of the cage and never popped open while riding.

Purchased this a few years ago. This is great for storing small essentials such as your keys, money clip/ID, phone, etc. Mounts just fine in typical metal cages, and offers easy access. I've not had it bounce out, but you can always wrap a length of velcro around the bottle cage (like the one you'd use to tie up your pants leg, which I usually keep on the bike anyway). Items stored inside may rattle a bit, but the liner helps, and you may have to stuff the container creatively if the rattling annoys you. It's also made in USA, which is really nice. There's a new version that has a belt clip, which should be even more useful.Cage Rocket's aftersales support is awesome, in case you ever need anything replaced.

I bought this years ago on sale through Nashbar. I use it secondly for a patch kit and one or two other small items. However, my primary reason for buying this though was to have a water-resistant and accessible housing for a battery pack, power-switch, and controller for a Down-Low-Glow lighting system. It has excelled in that department because I have never noticed any moisture from rain inside the cage rocket. Additionally, I do not even have the official water-proof version and I also worked in all weather conditions as a bike messenger in New York for several years. It should be noted in fairness I only gave it a 4 rating and added 1 con because after many years one of the hinge arms broke off and I had to use duct tape to keep the lid on. Respectfully though I should give it a 5 rating because recently after contacting Cage Rocket they not only replaced the lid quickly, but upgraded me to the stronger waterproof lid for less than two bucks [...]. I imagine my upgraded lid will last me many years to come and I appreciate the responsive service Cage Rocket provided me. As for the negative reviews I do not think the cage rocket is built cheaply. The material in the main compartment is pretty thick. I know because I had to cut through the bottom to run the wiring for my lighting system. As for the hinge, obviously there has to be some flex in the material for it to pop into place. I would not say the Cage Rocket is cheap, but rather designed simply and light weight. I might not recommend it for serious off-road down-hill style riding because loosely stowed contents will bounce around. Alternately over-stuffing the cage rocket in normal riding conditions may also force excess pressure on the hinges over time, which might have been why my original lid failed. Regardless I do think this is a good, thoughtful, and practical product with a considerate company behind it.

Guess it depends on how secure the rocket is in your bike cage. Mine has gotten launched a couple times, from rough terrain and the hinge broke, sending my tools everywhere. Seems a large mouth water bottle would accomplish this task without breaking apart. Like the concept though, easy to move from bike to bike.